20-02-2012, 01:06 AM
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20-02-2012, 01:06 AM
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20-02-2012, 10:10 AM
to get information about the topic synchronization of alternator with grid full report ppt and related topic refer the link bellow
https://seminarproject.net/Thread-microp...on?pid=138 https://seminarproject.net/Thread-microp...ion?page=2 https://seminarproject.net/Thread-microp...ion?page=3 https://seminarproject.net/Thread-microp...n?pid=4382 https://seminarproject.net/Thread-microp...ion?page=3 https://seminarproject.net/Thread-microp...near&pid=0 https://seminarproject.net/Thread-microp...ull-report
13-05-2013, 03:01 PM
SYNCHRONIZATION OF ALTERNATOR WITH GRID
SYNCHRONIZATION.docx (Size: 34.7 KB / Downloads: 50) ABSTRACT In an alternating current electric power system, synchronization is the process of matching the speed and frequency of a generator or other source to a running network. An AC generator cannot deliver power to an electrical grid unless it is running at the same frequency as the network. If two segments of a grid are disconnected, they cannot exchange AC power again until they are brought back into exact synchronization. A DC generator can be connected to a power network by adjusting its open-circuit terminal voltage to match the network voltage by either adjusting its speed or its field excitation; the exact engine speed is not critical. However, an AC machine must match both the amplitude and the timing of the network voltage, which requires both speed and excitation to be systematically controlled for synchronization. This extra complexity was one of the arguments against AC operation during the War of Currents in the 1880s. In modern systems, synchronization of generators is carried out by automatic systems. There are five conditions that must be met before the synchronization process takes place. The source (generator or sub-network) must have equal line voltage, frequency, phase sequence, phase angle, and waveform to that of the system to which it is being synchronized. Waveform and phase sequence are fixed by the construction of the generator and its connections to the system. During installation of a generator, careful checks are made to ensure the generator terminals and all control wiring are correct so that the order of phases (phase sequence) matches the system. Connecting a generator with the wrong phase sequence will result in a short circuit as the system voltages are opposite to those of the generator terminal voltages. The voltage, frequency and phase angle must be controlled each time a generator is to be connected to a grid. Generating units for connection to a power grid have an inherent droop speed control that allows them to share load proportional to their rating. Some generator units, especially in isolated systems, operate with isochronous frequency control, maintaining constant system frequency independent of load.
12-02-2017, 03:23 PM
please send me the detail synchronization details along wth ppts
13-02-2017, 11:18 AM
Synchronisation of the alternator means connecting an alternator on the grid in parallel with many other alternators, which is in a constant system of constant voltage and constant frequency. Many alternators and loads are connected in a grid, and all alternators in grid have the same output voltage and frequency (whatever the power). It is also said that the alternator is connected to infinite bus bar. A stationary alternator never connects to live bus-bars, as it will result in a short-circuit in the stater winding (since there is not yet a generated emf). Before connecting an alternator to the mains, the following conditions must be met: Equal Voltage: The voltage of the terminal of the incoming alternator must be equal to the voltage of the bus-bar. Similar frequency: The frequency of the generated voltage must be equal to the frequency of the voltage of the bus bar. Phase Sequence: The sequence of phases of the three phases of the alternator should be similar to that of the grid or bus bars. Phase Angle: The phase angle between the generated voltage and the mains voltage must be zero. The first condition of equal voltage can be satisfied by a voltmeter. To satisfy the conditions of equal frequency and identical phases, one of the following two methods can be used: (I) Synchronisation with incandescent lamp Ii) Synchronisation by synchroscope. 1- The two systems must have the same voltage, and the alternator voltage can be controlled by excitation to meet this condition. 2- The frequency must be the same and this can be achieved by controlling the speed of the primary motor. 3- The two systems must have the same sequence of phases. 4- The two systems must have a zero phase difference. So, let me assume you manged to achieve the first three conditions. Now I have an alternator that rotates with a speed and a frequency equal to the grid but there is a phase difference between them. |
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